Java读、写、修改Excel文件详解

import jxl.*;
import jxl.format.Underlinestyle;
import jxl.write.*;
import jxl.write.Number;
import jxl.write.Boolean;

import java.io.*;

/**
* Created by IntelliJ IDEA.
* User: xl
* Date: 2005-7-17
* Time: 9:33:22
* To change this template use File | Settings | File Templates.
*/
public class ExcelHandle
{
   public ExcelHandle()
   {
   }

   /**
    * 读取Excel
    *
    * @param filePath
    */
   public static void readExcel(String filePath)
   {
       try
       {
           InputStream is = new FileInputStream(filePath);
           Workbook rwb = Workbook.getWorkbook(is);
           //Sheet st = rwb.getSheet("0")这里有两种方法获取sheet表,1为名字，2为下标，从0开始
           Sheet st = rwb.getSheet("original");
           Cell c00 = st.getCell(0,0);
           //通用的获取cell值的方式,返回字符串
           String strc00 = c00.getContents();
           //获得cell具体类型值的方式
           if(c00.getType() == CellType.LABEL)
           {
               LabelCell labelc00 = (LabelCell)c00;
               strc00 = labelc00.getString();
           }
           //输出
           System.out.println(strc00);
           //关闭
           rwb.close();
       }
       catch(Exception e)
       {
           e.printStackTrace();
       }
   }

   /**
    * 输出Excel
    *
    * @param os
    */
   public static void writeExcel(OutputStream os)
   {
       try
       {
           /**
            * 只能通过API提供的工厂方法来创建Workbook，而不能使用WritableWorkbook的构造函数，
            * 因为类WritableWorkbook的构造函数为protected类型
            * method(1)直接从目标文件中读取WritableWorkbook wwb = Workbook.createWorkbook(new File(targetfile));
            * method(2)如下实例所示 将WritableWorkbook直接写入到输出流

            */
           WritableWorkbook wwb = Workbook.createWorkbook(os);
           //创建Excel工作表 指定名称和位置
           WritableSheet ws = wwb.createSheet("Test Sheet 1",0);

           //**************往工作表中添加数据*****************

           //1.添加Label对象
           Label label = new Label(0,0,"this is a label test");
           ws.addCell(label);

           //添加带有字型formatting对象
           WritableFont wf = new WritableFont(WritableFont.TIMES,18,WritableFont.BOLD,true);
           WritableCellformat wcf = new WritableCellformat(wf);
           Label labelcf = new Label(1,0,"this is a label test",wcf);
           ws.addCell(labelcf);

           //添加带有字体颜色的formatting对象
           WritableFont wfc = new WritableFont(WritableFont.ARIAL,10,WritableFont.NO_BOLD,false,
                   Underlinestyle.NO_UNDERLINE,jxl.format.Colour.RED);
           WritableCellformat wcfFC = new WritableCellformat(wfc);
           Label labelCF = new Label(1,0,"This is a Label Cell",wcfFC);
           ws.addCell(labelCF);

           //2.添加Number对象
           Number labelN = new Number(0,1,3.1415926);
           ws.addCell(labelN);

           //添加带有formatting的Number对象
           Numberformat nf = new Numberformat("#.##");
           WritableCellformat wcfN = new WritableCellformat(nf);
           Number labelNF = new jxl.write.Number(1,1,3.1415926,wcfN);
           ws.addCell(labelNF);

           //3.添加Boolean对象
           Boolean labelB = new jxl.write.Boolean(0,2,false);
           ws.addCell(labelB);

           //4.添加DateTime对象
           jxl.write.DateTime labelDT = new jxl.write.DateTime(0,3,new java.util.Date());
           ws.addCell(labelDT);

           //添加带有formatting的Dateformat对象
           Dateformat df = new Dateformat("dd MM yyyy hh:mm:ss");
           WritableCellformat wcfDF = new WritableCellformat(df);
           DateTime labelDTF = new DateTime(1,3,new java.util.Date(),wcfDF);
           ws.addCell(labelDTF);


           //添加图片对象,jxl只支持png格式图片
           File image = new File("f:\\2.png");
           WritableImage wimage = new WritableImage(0,1,2,2,image);
           ws.addImage(wimage);
           //写入工作表
           wwb.write();
           wwb.close();
       }
       catch(Exception e)
       {
           e.printStackTrace();
       }
   }

   /**
    * 拷贝后,进行修改,其中file1为被copy对象，file2为修改后创建的对象
    * 尽单元格原有的格式化修饰是不能去掉的，我们还是可以将新的单元格修饰加上去，
    * 以使单元格的内容以不同的形式表现
    * @param file1
    * @param file2
    */
   public static void modifyExcel(File file1,File file2)
   {
       try
       {
           Workbook rwb = Workbook.getWorkbook(file1);
           WritableWorkbook wwb = Workbook.createWorkbook(file2,rwb);//copy
           WritableSheet ws = wwb.getSheet(0);
           WritableCell wc = ws.getWritableCell(0,0);
           //判断单元格的类型,做出相应的转换
           if(wc.getType == CellType.LABEL)
           {
               Label label = (Label)wc;
               label.setString("The value has been modified");
           }
           wwb.write();
           wwb.close();
           rwb.close();
       }
       catch(Exception e)
       {
           e.printStackTrace();
       }
   }


   //测试
   public static void main(String[] args)
   {
       try
       {
           //读Excel
           ExcelHandle.readExcel("f:/testRead.xls");
           //输出Excel
           File fileWrite = new File("f:/testWrite.xls");
           fileWrite.createNewFile();
           OutputStream os = new FileOutputStream(fileWrite);
           ExcelHandle.writeExcel(os);
           //修改Excel
           ExcelHandle.modifyExcel(new file(""),new File(""));
       }
       catch(Exception e)
       {
          e.printStackTrace();
       }
   }
}

2.在jsp中做相关测试，创建一个writeExcel.jsp
<%
response.reset();//清除Buffer
response.setContentType("application/vnd.ms-excel");
File fileWrite = new File("f:/testWrite.xls");
fileWrite.createNewFile();
new FileOutputStream(fileWrite);
ExcelHandle.writeExcel(new FileOutputStream(fileWrite));
%>
在IE中浏览writeExcel.jsp就可以动态生成Excel文档了，其中response.setContentType("application/vnd.ms-excel");语句必须要，才能确保不乱码，在jsp中输入<%@page contentType="application/vnd.ms-excel;charset=GBK"%>不行。